<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!-<-border边框-->
<table border="1">
    <tr><!--table row表示行--><!--table data表格数据 表示列-->
        <!--colspan跨列-->
        <td colspan="2" align="center">1-1</td>><td>1-3</td><td>1-4</td>
    </tr>
    <tr>
        <!--rowspan跨行-->
        <td rowspan="2">2-1</td>><td>2-2</td><td>2-3</td><td>2-4</td>
    </tr>
    <tr>
        <td>3-1</td>><td>3-2</td><td>3-3</td>
    </tr>
    <table border="1">
        <tr><td>1-1</td><td>1-2</td><td>1-3</td></tr>
        <tr><td>2-1</td><td>2-2</td><td>2-3</td></tr>
        <tr><td>3-1</td><td>3-2</td><td>3-3</td></tr>
    </table>

</table>
</body>
</html>